Relativity /(-t?v"?-t?)/

Rel·a·tiv·i·ty

Relativity

n.
  1. The state of being relative; as, the relativity of a subject.
  2. One of two theories (also called theory of relativity) proposed by Albert Einstein, the special theory of relativity, or the general theory of relativity. From the special theory of relativity or special relativity follows several principles, such as the increase of mass with velocity and the impossibility of acceleration to a speed greater than that of light; the equivalence of mass and energy, expressed by the famous equation E = mc2; and time dilation. From the general theory of relativity or general relativity follow several results, of which the bending of light rays in a gravitational field and the equivalence of the inertial and gravitational masses have been verified. It also predicted the existence of black holes.